Dampening device



June 30, 1931. J. SCHULTZ 1,812,720

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June 30, 1931. SCHULTZ 1,812,720

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June 30, 1931. J ISCHUI TZ 1,812,720

DAMPENING DEVICE Fi led June 2. 192a 4 Sheets-Sheet 4 vii Patented June30, 1931 JOSEPH SCHULTZ, OF CLEVELAND, OHIO DAMPENING DEVICE Applicationfiled June 2, 1928. Serial No. 282,420.

My invention pertains to a dampening device and more particularly to anappliance for selectively controlling the supply of moisture to axiallyalined sections of a roller of a lithographic press. The drawingsexemplify an embodiment of my invention including both automatic andmanual water feed control appliances and which has been successfullyused on the standard type of 1c lithographic press.

In lithographing, a certain amount of moisture is required to keep theplate adequately dampened. My many years of experience with thelithographic industry convinces me that a conservative estimate shouldattribute thirtyper cent of the trouble encountered in lithographicprinting to the dampening procedure. At present, moisture is transferredfrom a roller immersed in a Water supply to a duct roller which ismovable into or out of contact with the waterroller and which, when itis in contact with the Water roller, is adapted to retransfer the waterto other dampening rollers and thence to the plate. It is important tocontrol the amount of transferred moisture in order to obtain thebest'results under varying conditions. A common type of water controlheretofore used, consists of what has come to be known as a water stopor wiping device for limiting the amount of water which is carried onthe water roller as it rotates in its bath. Not only does the requiredpressure of the wiper against the water roller act to Wear ofi its clothcovering, but it has always been inadequately satisfactory, becauseafter being set it prescribed the same amount of moisture substantiallyuniformly across the width of the plate or from one side of the press tothe other. As will be appreciated by those experienced in the art,different areas of printing on a sheet require diiferent degrees ofmoisture. For instance, in label -and poster production, which commonlyhave solid ink impressions, such products should be supplied with atleast" three differing amounts of moisture according to the relativelocations of uncovered areas of the plate,.of paper areas which are toreceive half-tone impressions or relatively small type and of paperareas which are to receive solidly inked impressions.

Accordingly, the general object of my invention is to supply moisture invarying quantity as and precisely where needed. A more specific objectof my invention is variously and selectively to apportion the deliveryor transfer of moisture in a direction parallel with the axes of theroller so that no moisture will be transferred to large uncovered areasof the plate, so that only a small amount of moisture will betransferred to the printing plate sections which will record thehalf-tone impressions and so that a greater amount of moisture ordampening effect will reach those portions of the plate by which solidlyinked streaks or solids are to be printed.

The varying grades of dampening requirements may be said to rangebetween two extremes, one being, for instance, lateral edge borderingareas of the plate which are not to come in contact with paper and hencerequire the least or no moisture, and the other being any solidly inkeddesign. My invention permits of precise regulation for all conditionsexpectably to be encountered.

Adverting to the drawings:

Figure 1 is a plan view of a standard type of lithographic press withcertain upper portions omitted to reveal the relative positions of theparts of a dampening device embodying my inventions.

Figure 2 is a vertical sectional view, partly in elevation, taken online 22 of Figure 1.

Figure 3 is a vertical section somewhat enlarged on line 3-3 of Figure2.

Figure .4 is a diagrammatic plan View of a sheet to be printed on alithograph press and 9 showing different intensities of ink required fordifferent portions of a print and a suitable corresponding selection ofsettings of adjustable elements of my improved device designated bynumbers.

Figure 5 is an enlarged view of a portion of Figure 2 showing certaindetails of the preferred form of my construction.

Figure 6 is a fragmentary elevation of a portion of Figure 5 looking inthe'direction indicated by the arrows on lines 66 of Figures 2 and 5.

Figure 7 is a correspondingly enlarged perspective view of one of theadjustable elements consisting, as exemplified, of a composite tapehaving five segments of varying thickness. 1

Figure 8 is aview corresponding to Figure showing a simplified modifiedform of supplementary water conducting means.

' Figure 9 is a perspective view of one of a series of adjustableappliances to be used in Figure 8.

Figure 10 is a partial view like Figure 8 with another modified detail.

Figure 11 is a perspective view of a somewhat shorter appliance than thesimilar one shown in Figure 9, and of the modified type adapted for usewith the apparatus illustrated in Figure 10.

That end of a lithograph press where the printed sheets are dischargedis usually considered to be the front end and therefore Figure. 1 hasbeen placed on the sheet so that its front side extends along the rightmargin of the sheet, but it will be perceived that the combination ofparts, constituting my dampening device, are all on the rear side of themultiple superposed rollers and in fact are carried by a bracketsupported on a pair of rods below a water pan, being pivotally mountedon one rod and adapted to be additionally supported by the other.

My experience with prior and present practice leads me to know thatreliance has been placed upon transference of water or moisture-from awater pan through the agency of a water roller partly immersed therein,together with a wiper on the rising side of the roller for limiting theamount of water carried around by the absorbent cover thereofpreparatory to selectively intermittent transfer to a bodily shiftabledampening duct roller by contact therewith. Present practice, so far asmy knowledge extends,

may be said to depend merely upon control of the amount of water carriedfrom a source of suppl, by a water roller. As contradistinguishe myinvention consists of a multiple selective control by the addition of anextra supply of moisture from above by means of a pluralityof'independentl operable water transferring appliances which areadjustably alined crosswise of the press or along the axis of the waterroller and which appliances themselves include adjustable units. Whileboth the preferred form and the simplified modification of my invention,as illustrated in the drawings, utilize the principle of capillaryattraction I would have it understood that I do not mean to have thepatent scope restricted thereby. The broad principle of supplying excessmoisture selectively in varying amounts at a plurality of alined pointscrosswise of the press might conceivably be accomplished by minutesprays from needle valves. It is to be realized that the scope of myinvention comprehends many equivalent methods and constructions. Theshowing of the drawings and the particular description are merelyspecific exemplifications of a plurality of mechanical embodiments andarrangements.

Since what is illustrated in Figure 1 of a standard lithograph press ismerely to disclose the relative location of my dampening device and todisclose in what manner it is attached thereto, only a few supportingand moisture conducting cooperating elements have been again illustratedin other figures and need be referred to in the description. A baseframe 1 comprises end standards 2 across which is mounted a shaft 3,connected with any suitable power drive, and carrying (see Figure 2) aprinting or paper cylinder 4:, which at one end has secured to it a gear5 in mesh with a gear 6 on a blanket cylinder 7 which is mounted onanother shaft 8. The gear 6 in turn meshes with a gear 9 which is fixedto a plate cylinder 10. In peripheral contact along the top of the platecylinder 10 are four ink rollers 11 and in contact with one side of theplate cylinder 10, as shown in both Figures 2 and 5, are a pair ofspaced dampening rollers 12 both of which contact with a rotating brassroller 13, the opposite side of which has peripheral engagement with adampening duct roller 14, which by means of mechanism designated in itsentlrety by the numeral 15, is bodily movable into and out of engagementwith a water roller 16 carried by a shaft-17. The bodily movement of thedampening duct roller 14 is adjustable for frequency and is usuallyaccomplished automatically. to suit the supposed requirements of anyparticular job. No further description should be required because thatcontrol has long been common practice.

The rear side of the upward extension of the press carries two spacedrods 18 and 19 and at opposite ends of the former are turnably mounted apair of brackets 20 including forward extensions and adapted to projectpast the ends respectively of a water pan 21 which extends acrosssubstantially from one side of the press to the other and hasconstituted a part of a standard press. The forward ends of the bracketsare adapted to rest on the rod 19. Set screws 22 are provided for fixingthe brackets 20 to the rod 18. Upon loosening the set screws 22 theentire superstructure, which is carried by the brackets 20 may be swungrearwardly about the rod 18 as an axis to bring it to an inutileposition for inspection or repair. Connected with the water pan 2]. is atube 23, preferably fiexible which extending downwardly, as

shown in Figure 2, leads into a main water supply or reservoir 24:,which is appropriately secured in position in any suitable manerareo nerof. no consequence to this invention. Leading from the reservoir 24 is ahose 25 carrying on its immersed inlet end a strainer 26 and connectedat its outer end with a pump 27 driven by a pinion 28 which is in meshwith the gear 5 on the printing cylinder. The discharge port of the pump27 is connected with an upwardly extending hose 29 leading to anddischarging into an upper auxiliary Water supply to be later described.

Secured in an upstanding position to each of the brackets 20 is a shortrod 30 to which is adjustably secured a shelf 32-by means of acommon'pair of lock nuts 33 which are located on opposite sides of theshelf. A longer upstanding rod 31 is similarly supported by each of thebrackets '20 and is similarly secured to the shelf by a pair of locknuts 34. Secured in any suitable manner to the shelves 32 is anauxiliary water pan 35 provided with an overflow pipe 36 and a drainpipe 37 controlled by a valve 38 and adapted to drain any water in thepan 35 into the pan 21. The forward side of the pan 35 has dependingfrom it a rather thick, yet yielding, wiper 39, which may be composed ofmolleton absorbent cloth, and which is secured along its upper border tothe pan 35 by screws 40. It should be understood that the wiper 39extends crosswise of the press along the entire length of the pan 35 andso that its lower end contacts with substantially the entire length ofthe water roller 16. It may be here interpolated that this preferredform of my invention does not necessarily require a cloth covering onthe water roller and accordingly avoids the necessity of rather regularreplacement because of wear thereof.

The screw threaded upper ends of the two longer rods 3l are providedwith lock nuts 41 between each pair of which is clamped a forwardlyprojecting bracket 42 between which is mounted a rod 43 on which areloosely mounted a large group of spools 44. Also loosely carried by therod 43 between each pair of the spools 44 are elongated spacing hangers45 which extend somewhat above the tops of the spools 44- and downwardlyto a position near the bottom of the pan 35. The lower ends of thespacers 45 are intersected by a rod 46 which loosely carries acorresponding number of smaller spools 47 likewise positioned onebetween each pair of spacers. It should be understood that the spacinghangers 45 exercise the function of loosely hung hangers so that thespools '47 tend gravitationally to swing to a position to bring the rod46 vertically below the rod 43.

In order not to obstruct the desired extent of other entirely free rod49 carries a correi135 sponding number of similarly alined spools 50which are arranged in a row mainly within the confines of the pan 35.

An endless composite tape or band, designated in its entirely by thenumeral 51, extends around each set of three spools 44, 47 and 50 whichare disposed in the same vertical plane and so that each tape isnormally held fairly taut by the weight of one of the spools 50 and aproportional amount of the weight of the rod 49. It will be observedthat each composite tape extends over the forward rim of the pan 35 at apoint between itsenveloped spools 47 and 50 and so as to maintain itsspool 50 elevated with respect to the bottom of the pan 35. As soarranged all the tape structures may be adjusted up or down by means ofthe lock nuts 41 and that rearwardly presented portion of the compositetape which is in contact with the rear of one of the spools 47 isgravitationally adapted to .rest against the wiper 39, not only toinsure pressure of the latter against the water roller16, but totransfer water thereto as will now be explained.

Each composite tape includes, as exemplified in Figure 7 five segmentalsections of progressively varying thickness. One section 52 isnonabsorbent and may be composed of flexible metal, the next four 53,54, 55 and 56 are in sequential order of progressive- 1y heavierabsorbent material (felt or molleton) and are proposed uniformly toconduct or transfer correspondingly varying amounts of water from thepan 35 to the wiper 39 by capillary attraction. That is to say, thesection 53 will transfer less water than the somewhat thicker section 54of enhanced absorbing properties, or the section 56 of heaviest materialwill transfer even more water than the section 54. The purpose of theunabsorbing section 52 is to provide one section which, when it occupiesthe pan rim-overlywill frustrate the transference of moisture. It shouldbe understood that the number of distinct sections of which each tape iscom posed, may be varied according to the requirements of differentpresses. The independent adjustment of the tapes may be readily effectedby manipulation and the number of alined tapes provided clearlyevidences the enormous range of selectivity for dete r mining varyingamounts of moisture crosswise of the press which it may be desired toestablish to realize the intended benefiting control. The endlesscomposite tape 51, or that portion of it which conducts water from thereservoir 35, to the member 39,, is in effect a siphon, as it carriesthe water from the reservoir to a point, outside of the reservoir, at alevel lower than the top of the liquid in the reservoir. 3 1

Figure 4 is intended clearly to exemplify the application of theprinciple of my invention, and in viewing it the laterally extendingportion, in which it appears in Figure 5,

ing row of five numerals from 04 inclusive are to be considered ascorresponding in sequential order to the five segmental sections 52, 53,54, 55 and 56, indeed, each tape preferably has such numerals markedthereon to aid the operator to quickly perceive the location of each.Figure 7 reveals the two sections 55 and 56 so marked with the numerals3 and 4. Inspection of Figure 4 will show the lateral margins of thepress or ends of the dampening rollers to be bounded by vertical planesrepresented by lines 57 and 58. Inwardly of the lines 57 and 58, lines59 and 60similarly represent vertical planes determining the lateralboundaries or width of a paper sheet. The margins 61 between the lines57 and 59 and between the lines 58 and 60 represent portions of thepress not being used or not co'vered by paper which is required toabsorb some and usually a varying degree of moisture. The uncoveredmargin 61 will not require the deposition of any moisture and the twoseparated rows of nine zeros, extending across each, are intended toevidence that the seven tapes, which are disposed within the boundariesof each of the margins 61, have been adjusted to the positionillustrated in Figure 5 where the zero section 52 of metal extends overthe edge of the auxiliary water pan so as to preclude exercise ofcapillarity. Bordering each of the uncovered margins 61 are two strips62 representing half-toned areas or typed areas which will require some,but not the greatest amount of moisture. extending across the strip 62in the direction toward the middle, are three numerals 1 and next threenumerals 2 to thereby indicate that the next six adjustable tapes oneach side have been so adjusted that the first three have the section 53extending over the front rim of the auxiliary water pan 35 The section53 (actually marked with the numeral 1) being the thinnest of the fourwater absorbing sections will cause the least amount of moisture to bedrawn from the pan 35 for transference to the wiper 39 and thence to thewater roller 16. The three numerals 2 are likewise intended to show thatthe next three tapes have their sections 54 which are of somewhatgreater thickness on duty or functionatin to transfer moisture bycapillary attractlon. The reason for showing both numerals 1 and 2extending across the half-tone area 62 is because it is thoughtpreferable to suggest the possibility of a more gradual transition fromone degree of water transference to another. It should be understood,however, that it might be preferred to have four or five numerals 1adjacent the nine zeros and accordingly only two or one numeral 2respectively within the lateral confines of the strip 62, indeed, thenext numeral 3 prior to the series of four numerals 4 evidences such aselective variation. The six It will be noticed that numerals 4 extendmainly across each of two interjacent heavy or solid color areas 63where the most moisture is expectably to be desired and which thethickest section 56 and represented by the numeral 4, is adapted toaccomplish when brought to its functioning position with one endimmersed in the water in the pan 35 and its other end in contact withthe wiper 39, because of the gravitational pressure of the latter of thecombined /hangers 45, rod 46 and spools 47. The middle strip or area 64which denotes a light color or strong half-tone will probably beadequately supplied with moisture by use of the section 55, designatedas appears in F igure 7 by the numeral 3.

It is to be remembered that since Figure 1 is a plan view lookingdownwardly upon the entire row of composite tapes, the rows of numeralsthere appearing will not correspond to the row of numerals in Figure 4,because in looking downwardly upon the composite tapes the numeralsdesignating the two upper sections which are not functionating appear toview. For iiistance, to consider the composite tape at the left end inFigure 1 where the numeral 2 appears above and the numeral 3 below,which is to say, the numeral 3 will be nearest the operator, thatparticular composite tape furthest to the left happens therefore to havethe locationsof its sections corresponding with the relative locationsof the sections in Figure 5 and in Figure '7, so that the zero section52 is in its watertransferring obstructing position. It is be cause theoperator is facing toward what is known as the front of the machine thatthe numerals 0, 1, 2, 3 and 4 appear in reading alinement as viewed fromthe left margin of sheet one and hence upside down if Figure 1' beviewed from the opposite margin of the sheet in the customary manner.The numerals l and 2 appear inverted in Figure 6 for the same reason, orto insure that they will legibly appear to the operator during hismanual adjustments. To consider one other particular group ofadjustments, it will be observed, upon inspection of Figure 4, that themiddle light color or strong half-tone strip area has been indicated tobe receiving such an amount of moisture as the section 55, which isactually marked with the numeral 3, is designed to transfer by capillaryattraction by reason of extending over the front rim of the auxiliarywater pan 35. Shifting scrutiny to Figure 1 and with consideration ofthe adjacent series of composite tapes which extend across the width ofthe middle area 64, it is there observable that seven tapes are adjustedalike and that such seven tapes, in order to correspond with thediagrammatic showing of Figure 4, have their sections .55 in functioninposition and therefore would show from a ove seven number 1 sectionsnearest the operator and seven zero sections forwardly beyond, which isto say, above, as shown in Figure 1.

Operation It will be realized that as soon as the press is started theoperation of the pump 27 will commence whereby water is continuallysupplied to the upper or auxiliary water pan 35 where its level ismaintained by the overflow pipe 36 which discharges into the lower pan21 from which it overflows through the tube 23 back into the mainreservoir 24. All skilled printing involves, at least initially, the cutand try procedure until the best combination of adjustments for goodwork have been effected. Such adjustments involve the frequency ofbodily swing of the dampening duct, roller 14, the determination ofelevation of the entire row of composite tapes through the agency of thelock nuts 41, selection as to length and thickness of the wiping apron39 and multiple selectivity of adjustment of the composite tapes, singlyor in groups, according to a skilled determination of the requirementsfor achievement of a perfect job. The rapidity of rotation of compositetape carried structure has the rollers precludes a merging towardequalization of the varying degrees of moisture existing in the wipingapron 39, from oneside of it to the other, and consequently suchvariations are substantially maintained as annular rings or zones on thewater roller 16, on the dampening duct roller 14, on the brass roller13, on the dampening rollers 12 and on the plate cylinder 10. Any slightI marginal equalization may be readily and/or compensatingly controlledby the interpositioning of a single distinct tape adjustment, as, forinstance, that evidenced by the numeral 3 between the numerals 2 and 4:at the bottom of the right marginal line of that heavy or solid color 63which is furthest to the right. a.

The views on Sheet 4 pertain to simplified modifications. All the partsin Figure 8 which are identical with the corresponding parts previouslydescribed, are supplied with the same r ference numerals, and the waterroller 16 is shown covered with cloth 65 and instead of the longer rods31, somewhat shorter, but otherwise equivalent, rods 66 are employed,since, according to this form the een omitted. In substitution for thetapes I provide any desired number of clips 67 which may be of stampedmetal to include handles 68 alon their tops. The clips are all ofbifurcate. form to enclose arched absorbent material 69, the two edgesof which are curled outwardly around the lower edges of the clips wherethey are stitched thereto, as indicated by the numeral 70. The manner ofeffecting attachment at this point is of no particular consequence andmanifestly might be otherwise accomplished. The two extensions of theclip 67 are spaced far enough apart to readily straddle the combinedthickne'ss of the forward wall of the auxiliary pan 35 and of the wipingapron 39 with its attaching screws 40, so that the clips may besuspended and readily adjustably moved crosswise in any desiredarrangement as a row. Manifestly, the less width the clips 67 have, thegreater the number which may be gravitationally carried as a crosswiseextending row. It will be observed that the rearward ends of theabsorbent material 69 are immersed in the water in the pan 35,

whereas their forward ends bear against the apron 39. According to thisform, a clip will be entirely omitted between those vertical planeswhich define longitudinal strip areas, like 61, where it' is not desiredto have cise the function of the apron 39 by rubbing engagement with thecloth 65.

I claim 2- I 1. Means for dampening in printing upon sheets carried upona lithographic press, comprising a water reservoir, a roller, anappliance including a composite element adapted by capillarity totransfer moisture from said reservoir to said roller, and means foradjusting said element whereby to vary its function of utilizingcapillary attraction.

2. Means for dampening in printing upon sheets carried upon alithographic press, comprising a water reservoir, a roller, 9. pluralityof appliances each including a composite element distinct portions ofwhich are adapted by capillarity to transfer varying amounts of moisturefrom said reservoir to said roller, and independently operable means forselectively adjusting said elements respectively to bring chosenportions thereof to their functioning positions.

3. Means for dampening in printing upon sheets carried upon alithographic press, comprising a moisture receiving element and aplurality of moisture-conveying units arranged to extend crosswise ofthe press and adapted to gravitationally convey water to the top of saidreceiving element and means whereby the functioning ofsaid units may beseparately controlled.

cans for dampening in printing upon ture-conveying units arranged abovesaid roller, so as collectively to extend across the path of movement ofsaid sheets and means for controlling the functioning of certain of saidunits.

5. In a dampening device of the character described, the combination ofa Water reservoir, a roller and appliances including siphon elements fortransferring water from said reservoir to said roller, parts of saidappliances being independently adjustable.

6. In a dampening device of the character described, the combination ofa frame, a water reservoir carried by said frame, rollers mounted onsaid frame, appliances comprising capillary elements arranged in a rowacross said frame and adapted to transfer water from said reservoir tosaid rollers, said appliances including independently adjustableelements whereby to vary their water transferring function.

7. In a device of the character described, the combination of a waterroller a plurality of auxiliary water feeding appliances extending in arow above and axially along said roller and a water-transferringconnection between said appliances and the upper surface of said roller.

8. In a device of the character described, the combination of a waterpan, a water roller immersed in said pan, an auxiliary water pan abovethe first mentioned pan, a plurality of auxiliary water feedingappliances carried in a row across said auxiliary pan, a water conductorcontacting the upper side of said roller and adapted to receive Waterfrom said appliances.

9. Incombination, a water reservoir, and an appliance including awater-absorbing element extending over an edge of said reservoir anddepending inside and outside thereof, said appliance adapted to conductwater from sa1d reservoir by capillary attraction, and a water carryingroller to receive water from said appliance.

10. In combination, a water reservoir, and a plurality of adjustablymounted appliances each including a water-absorbing element extendingover an edge of said reservoir and depending inside and outside thereof,said appliances adapted to conduct water from.

said reservoir by capillary attraction, a water-carrying roller and anabsorbent element contracting said roller and arranged to receive Waterfrom said appliances. 7

11. In combination, a water-transferring member, a source of water abovesaid member and a plurality of water-dispensing appliances comprisingsiphon elements adapted to receive water from said supply and deliver itto said member.

12. In combination, a water-transferring member, a source of water abovesaid-memand a plurality of water-absorbing elements adapted to receivewater from said supply and deliver it by eapillarity to said member.

13. In combination, a water roller, a source of water above said roller,and a contrivance including a plurality of water dispensing elementsadapted to receive Water from said supply and a member for transferringit to said roller, said elements being adjustable relative to the axisof said roller.

14. In combination with a lithograph press, a water roller, a waterreservoir, a plurality of endless moisture transferring structuresimmersed in said reservoir and extending in a row outside of saidreservoir, said structures including elements shiftable to alternativepositions so as to be capable of transferring varying amounts of water,and an apron contacting the periphery of said roller and adapted toreceive the Water transferred from said elements.

15. In combination with a lithograph press, a water roller, a source ofwater supply, a plurality of endless moisture transferring structures,said structures including elements adapted to receive and conduct waterfrom said supply turnable to alternative positions, and compositeendless tapes including sections of varying thicknesses of absorbentmaterial adapted to transfer varying amounts of water toward theperiphery of said roller.

16. In combination, a water reservoir, a water distributing member and aflexible appliance including a Water absorbing element extending over anedge of said reservoir and depending inside and outside thereof, saidappliance adapted to conduct water from said reservoir to saiddistributing member, and means for maintaining said appliance taut.

17. In a dampening graphic press or the llke, in combination, a waterpan, a roller partially immersed in said pan, an auxiliary water pan,and controllable means for transferring liquid from said auxiliary panto said roller.

18. In a dampening device for a lithographic press or the like, incombination, a water pan. a roller partially immersed in said pan, anauxiliary water pan, and controllable means for transferring liquid fromsaid auxiliary pan to said roller, said auxiliary water pan beingprovided with an overflow adapted to discharge into said water pan.

19. In a dampening device for a lithographic press or the like, incombination, a water pan, a roller partially immersed in said pan, anauxiliary water pan, controllable means for transferring liquid fromsaid auxiliary pan to said roller, automatic means for supplying liquidto said pans and means for maintaining the water level in said panssubstantially constant.

20. In a dampening device for a lithographic press or the like, incombination, a source 0 liquid, a liquid receiving roller, a

device for a litholiquid transfer device; said liquid transfer devicecomprising a liquid feeding element and aliquid distributing element,said liquid feeding element being adapted to feed liquid from saidsource to said distributing element, and said distributing element beinadapted to distribute said liquid to said rol er.

21. In a dampenln graphic pressror the li e, a roller, meansforsubstantially uniformly coating said roller with a predetermined amountof liquid and means for adding liquid to said coating.

22. In a dampening device, in combination, a roller, means adapted tosupply a substantially uniformly distributed coating of liquid to saidroller, and a plurality of devices each adapted to independently addliquid to said coated roller, and means adapted to regulate the amountof liquid added.

23. A dampening device for use on a lithographic offset press or thelike, comprising a roller whose periphery is partially immersed inliquid and means adapted to add liquid to the upper portion of theperiphery of said roller. f

24. In a dampening device, a rotatable roller whose periphery ispartially immersed in a liquid reservoir, and means adapted to addliquid to the periphery of said roller, after said periphery has emergedfrom the liquid reservoir and before it re-enters the same.

25. In a dampening device, a rotatable roller whose periphery ispartially immersed in a liquid reservoir, and a plurality of deviceseach adapted to independently add liquid to the periphery of saidroller.

26. In a dampening device for use on a lithographic ofiset press or thelike, in combination, a water roller whose periphery is par- .tiallyimmersed in liquid, a ductor roller adapted to contact said waterroller, and means adapted to add liquid to the periphery of said waterroller at a point between the line of emersion of the periphery of thewater roller from theliquid and the line of contact of the ductor rollerwith this periphery.

Signed by me, this 28th dlaly of May, 1928.

JOSE]? SCHULTZ. A

device for a litho-

